We report the first experimental evidence of second-harmonic generation due to intersubband transitions in GaAs-Ga1−xAlxAs step multiquantum wells with a waveguiding surface-emitting structure. The second-harmonic generation signal obeys wave vector conservation and propagates perpendicular to the waveguiding surface. As high as 3×10−3 power conversion efficiency has been obtained. The experimental analysis and the severalfold benefit of this novel technique have been given in detail.
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Chen et al. (1993) studied this question.
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